# External Module Protocols

# PPM

![PPM protocol waveform](../assets/images/PPM.png)

# PXX (FrSky XJT)

![PXX protocol waveform](../assets/images/PXX.png)

# ACCESS (FrSky RM900 ACCESS)

![ACCESS protocol waveform](../assets/images/ACCESS.png)

# DSM2 (Spektrum hacked module)

125000 bauds 8N1 - No parity

![DSM2 protocol waveform](../assets/images/DSM2.png)

# SBUS (Normal mode)

100000 bauds - Inverted - Even parity

![SBUS Normal protocol waveform](../assets/images/SBUS%20Normal.png)

# Multimodule

100000 bauds - Even parity - 2 stops bit

![MULTI protocol waveform](../assets/images/MULTI.png)

# Crossfire

400000 bauds (or reduced depending on radio capabilities) - Inverted

![XFIRE protocol waveform](../assets/images/XFIRE.png)